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Continuous Data Protection and Recovery

An ‘undo’ button for unintended changes in your data
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What is Continuous Data Protection?

Continuous Data Protection (CDP) is a backup and recovery technique that replicates and time stamps every incremental change to critical dataset. In the event of data corruption from logic errors, user mistakes or malware, one can roll back to the specific point in time before the undesired update occurred. Operations may then be resumed as if the problem never happened.

DataCore SANsymphony software-defined storage solution leverages built-in CDP functionality to record every update to a volume in a separate location and time stamp it. Unlike periodic snapshots, it is fully automated and happens continuously in real time. CDP complements your backup solution without being a replacement for it.

CDP Feature Highlights

  • Protect against damage from ransomware, malware and other sources of data corruption
  • Rollback to restore a volume to an arbitrary point-in-time state within a 14-day time frame
  • Generate known-good restore points
  • Logs and timestamps all I/Os to the selected virtual disks
  • Operates independent of operating system or applications
  • No need to quiesce or interrupt applications
  • No host agents required
  • Easy to enable protection and create rollback volumes

How Continuous Data Protection Works

CDP records every write I/O (or change), with a corresponding timestamp, that occurs against a protected volume. With continuous data protection, a rollback volume can be created representing any point-in-time just before the undesired event occurred. The rollback volume is then mapped to the original application server or a different one.

For example, consider a virus causing damage to a volume at 2:41:36 PM; a rollback volume is created for any point in time prior and served back to the original application server. Also, consider a user deleting a file at 3:15 PM; a rollback volume is created for 3:00 PM and mapped to a different file server for retrieval, all with no interruption to the production volume.

Similar to snapshot requests, one can generate periodic CDP Rollback Volumes at known-good restore points by scripting a call to a PowerShell cmdlet each time an application has been quiesced and the caches have been flushed to storage.

How Continuous Data Protection Works
As data is written to the protected production volume, a copy of each write I/O is copied to the designated continuous data protection buffer pool. A rollback volume can be created based on the data that resides in the CDP buffer pool at a specified time.

Understanding the Difference Between True CDP and Near-CDP

True CDP is the process where data copies are captured every time there is a data change at source and is a continuous incremental recording process. True CDP offers a recovery point objective (RPO) of close to zero, which means there is no data loss.

Near-CDP, as the name indicates, is a near-continuous process where there is a pre-defined time interval for snapshotting the data. Near-CDP offers an RPO of however-often-you-are-taking-a-snapshot (typically one hour).

DataCore SANsymphony offers true CDP as part of its built-in data services, which can be used in tandem with a traditional backup solution to prevent data loss and aid in disaster recovery.

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